CN108909494B - Charging system and electric automobile - Google Patents
Charging system and electric automobile Download PDFInfo
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- CN108909494B CN108909494B CN201810738814.3A CN201810738814A CN108909494B CN 108909494 B CN108909494 B CN 108909494B CN 201810738814 A CN201810738814 A CN 201810738814A CN 108909494 B CN108909494 B CN 108909494B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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Abstract
The invention provides a charging system and an electric automobile, and relates to the technical field of automobile charging, wherein the charging system comprises: the charging interface is connected with the direct current charging pile or the alternating current charging pile through a charging gun; the power battery is connected to the charging interface through the charger and the first control switch respectively; the charger comprises a pre-charging circuit provided with a second control switch and a third control switch connected with the pre-charging circuit in parallel; the connection state confirmation unit is connected with the charging interface and used for detecting the connection states of the charging interface, the direct current charging pile and the alternating current charging pile; the controller is respectively connected with the connection state confirmation unit and the control switches and is used for enabling the first control switch to be closed and the second control switch and the third control switch to be disconnected when the charging interface is connected with the direct-current charging pile; when the charging interface is connected with the alternating-current charging pile, the first control switch and the third control switch are switched off, the second control switch is switched on, and when the power battery reaches a preset voltage, the third control switch is switched on. The invention simplifies the system structure.
Description
Technical Field
The invention belongs to the technical field of automobile charging, and particularly relates to a charging system and an electric automobile.
Background
With the development of economic technology, automobiles are more and more popular, and in order to meet the requirements of energy conservation and emission reduction, an electric automobile is gradually a leading product in the automobile market as a novel green environment-friendly vehicle.
In the prior art, in order to charge the electric vehicle by different charging modes, two charging interfaces and two charging systems respectively matched with the two charging interfaces are arranged on the electric vehicle, one charging system is used for slowly charging a power battery of the electric vehicle by using an alternating current charging pile under the condition that the time of a user is abundant, and the other charging system is used for quickly charging the power battery of the electric vehicle by using a direct current charging pile under the condition that the time of the user is short; thus, the charging system is complicated, occupies a large space of the whole vehicle, and increases the cost.
Disclosure of Invention
The embodiment of the invention aims to provide a charging system and an electric automobile, so that the problems that the charging system of the electric automobile is complex, the occupied whole automobile layout space is large and the cost is high in the prior art are solved.
In order to achieve the above object, the present invention provides a charging system applied to an electric vehicle, including:
the charging interface is used for being connected with the direct current charging pile or the alternating current charging pile through a charging gun;
the power battery is connected to the charging interface through a charger and a first control switch respectively; the charger comprises a third control switch and a pre-charging circuit which is connected with the third control switch in parallel and is used for pre-charging the power battery by the charging interface, and a second control switch is arranged on the pre-charging circuit;
the connection state confirmation unit is connected with the charging interface and used for detecting the connection states of the charging interface, the direct current charging pile and the alternating current charging pile;
the controller is respectively connected with the connection state confirmation unit, the first control switch, the second control switch and the third control switch, and is used for controlling the first control switch to be in a closed state and the second control switch and the third control switch to be in an open state when the connection state confirmation unit detects that the charging interface is connected with the direct-current charging pile; when the connection state confirmation unit detects that the charging interface is connected with the alternating-current charging pile, the first control switch and the third control switch are controlled to be in an off state, and the second control switch is controlled to be in a closed state; and when the charging interface is connected with the alternating-current charging pile and the voltage of the power battery reaches a preset voltage, controlling the third control switch to be in a closed state.
The connection state confirming unit is used for determining that the charging interface is connected with the direct current charging pile when detecting that the resistance value of the charging interface is a first preset resistance value; when the resistance value of the charging interface is detected to be a second preset resistance value, it is determined that the charging interface is connected with the alternating-current charging pile, wherein the first preset resistance value is smaller than the second preset resistance value.
The controller is further configured to control the first control switch, the second control switch and the third control switch to be in an off state when the connection state confirmation unit detects that the charging interface is not connected with the alternating-current charging pile and the direct-current charging pile.
A first output end of the controller is connected with the first control switch, a second output end of the controller is connected with the second control switch, and a third output end of the controller is connected with the third control switch;
when the connection state confirmation unit detects that the charging interface is connected with the direct current charging pile, a first output end of the controller outputs a first signal to close the first control switch;
when the connection state confirmation unit detects that the charging interface is connected with the alternating-current charging pile, a second output end of the controller outputs a second signal to close the second control switch;
when the second control switch is closed and the voltage of the power battery reaches a preset voltage, the third output end outputs a third signal to close the third control switch.
Wherein the charging system further comprises: a first voltage conversion circuit connected between the first output terminal and the first control switch; a second voltage conversion circuit connected between the second output terminal and the second control switch; and a third voltage conversion circuit connected between the third output terminal and the third control switch;
the first voltage conversion circuit is used for responding to the first signal and outputting a first voltage signal with a first voltage value to the first control switch to close the first control switch;
the second voltage conversion circuit is used for responding to the second signal and outputting a second voltage signal with a second voltage value to the second control switch to close the second control switch;
the third voltage conversion circuit is configured to output a third voltage signal having a third voltage value to the third control switch in response to the third signal, so that the third control switch is closed.
Wherein the charging system further comprises: the first signal acquisition circuit is connected between the first output end and the first input end of the controller, and the second signal acquisition circuit is connected between the second output end and the second input end of the controller; a third signal acquisition circuit connected between the third output terminal and a third input terminal of the controller;
the first signal acquisition circuit is used for acquiring the first signal and feeding the first signal back to the controller; the controller is used for outputting a first fault signal to an instrument desk of the electric automobile when the first signal is different from a first preset signal;
the second signal acquisition circuit is used for acquiring the second signal and feeding the second signal back to the controller; the controller is used for outputting a second fault signal to the instrument desk when the second signal is different from a second preset signal;
the third signal acquisition circuit is used for acquiring the third signal and feeding the third signal back to the controller; the controller is used for outputting a third fault signal to the instrument desk when the third signal is different from a third preset signal.
Wherein the charging system further comprises:
the fourth signal acquisition circuit is connected between the output end of the first voltage conversion circuit and the fourth input end of the controller; the fifth signal acquisition circuit is connected between the output end of the second voltage conversion circuit and the fifth input end of the controller; the sixth signal acquisition circuit is connected between the output end of the third voltage conversion circuit and the sixth input end of the controller;
the fourth signal acquisition circuit is used for acquiring the first voltage signal and feeding the first voltage signal back to the controller; the controller is used for outputting a fifth fault signal to an instrument desk of the electric automobile when the first voltage signal is different from a first preset voltage signal;
the fifth signal acquisition circuit is used for acquiring the second voltage signal and feeding the second voltage signal back to the controller; the controller is used for outputting a sixth fault signal to the instrument desk when the second voltage signal is different from a second preset voltage signal;
the sixth signal acquisition circuit is used for acquiring the third voltage signal and feeding the third voltage signal back to the controller; and the controller is used for outputting a seventh fault signal to the instrument desk when the third voltage signal is different from a third preset voltage signal.
And when the voltage of the power battery reaches a preset voltage, the second output end outputs a fourth signal to disconnect the second control switch.
The second signal acquisition circuit is further used for acquiring the fourth signal and feeding the fourth signal back to the controller; the controller is used for outputting a fourth fault signal to the instrument desk when the fourth signal is different from a fourth preset signal.
The second voltage conversion circuit is further configured to output a fourth voltage signal having a fourth voltage value to the second control switch in response to the fourth signal, so that the second control switch is turned off.
The fourth signal acquisition circuit is further used for acquiring the fourth voltage signal and feeding the fourth voltage signal back to the controller; the controller is used for outputting an eighth fault signal to the instrument desk when the fourth voltage signal is different from a fourth preset voltage signal.
The charger is further provided with an alternating current-direct current conversion circuit connected with the pre-charging circuit and used for converting alternating current output by the alternating current charging pile into direct current.
The embodiment of the invention also provides an electric automobile which comprises the charging system.
The technical scheme of the invention at least has the following beneficial effects:
according to the embodiment of the invention, only one charging interface is arranged on the electric automobile and is respectively connected with the power battery through the charger and the first control switch, so that when the power battery of the electric automobile is charged, the same charging interface is utilized to carry out alternating current slow charging through the charger or direct current fast charging through closing the first control switch, the number of charging wire bundles of the electric automobile is reduced, and the cost is saved; the arrangement space of the charging system is saved, and the whole vehicle is convenient to arrange; meanwhile, the charging process of the user is simpler and more convenient.
Drawings
Fig. 1 is a first schematic diagram of a charging system according to an embodiment of the invention;
fig. 2 is a second schematic diagram of a charging system according to an embodiment of the invention.
Description of reference numerals:
1-a charging interface, 2-a power battery, 3-a charger, 4-a connection state confirmation unit, 5-a controller, K1-a first control switch, K2-a second control switch, K3-a third control switch, K4-a fourth control switch, R-a pre-charging resistor, 31-a filter circuit, 32-an alternating current and direct current conversion circuit, 61-a first signal acquisition circuit, 62-a second signal acquisition circuit, 63-a third signal acquisition circuit, 64-a fourth signal acquisition circuit, 65-a fifth signal acquisition circuit, 66-a sixth signal acquisition circuit, 67-a seventh signal acquisition circuit, 68-an eighth signal acquisition circuit, 71-a first voltage conversion circuit, 72-a second voltage conversion circuit and 73-a third voltage conversion circuit, 74-fourth voltage conversion circuit.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The embodiment of the invention aims at the problems that in the prior art, a direct current charging system for fast charging and an alternating current charging system for slow charging on an electric automobile are two independent systems, so that the occupied space is large, and the cost is high.
As shown in fig. 1, an embodiment of the present invention provides a charging system applied to an electric vehicle, where the charging system includes: the charging interface 1 is used for being connected with a direct current charging pile or an alternating current charging pile through a charging gun; the power battery 2 is respectively connected to the charging interface 1 through a charger 3 and a first control switch K1; the charger 3 comprises a third control switch K3 and a pre-charging circuit which is connected with the third control switch K3 in parallel and is used for pre-charging the power battery 2 by the charging interface 1, and a second control switch K2 is arranged on the pre-charging circuit; a connection state confirmation unit 4 connected to the charging interface 1, and configured to detect a connection state between the charging interface 1 and the dc charging pile and between the charging pile and the ac charging pile; the controller 5 is connected to the connection state confirmation unit 4, the first control switch K1, the second control switch K2, and the third control switch K3, and configured to control the first control switch K1 to be in a closed state, and control the second control switch K2 and the third control switch K3 to be in an open state when the connection state confirmation unit 4 detects that the charging interface 1 is connected to the dc charging pile; when the connection state confirmation unit detects that the charging interface 1 is connected with the alternating-current charging pile, the first control switch K1 and the third control switch K3 are controlled to be in an open state, and the second control switch K2 is controlled to be in a closed state; when the charging interface 1 is connected with the alternating-current charging pile and the voltage of the power battery 2 reaches a preset voltage, the third control switch K3 is controlled to be in a closed state.
In the embodiment of the present invention, as shown in fig. 1, a pre-charging resistor R connected in series with the second control switch K2 is further disposed on the pre-charging path, and the pre-charging resistor R is configured to limit a current input to the power battery 2 when the ac charging pile charges the power battery 2, so as to avoid a capacitor in the power battery 2 from being damaged due to an excessive instantaneous current. In addition, because the charger 3 is provided with a zero line and a live line, in this embodiment, control switches need to be respectively arranged on the zero line and the live line, so as to realize the complete connection or the complete disconnection between the charging interface 1 and the power battery 2, specifically, as shown in fig. 1, the pre-charging circuit and the third control switch K3 connected in parallel with the pre-charging circuit are equivalent to a live line, and a line provided with the fourth control switch K4 is equivalent to a zero line.
According to the embodiment of the invention, the power battery 2 is connected with the charger 3 and the first control switch K1 to the charging interface 1 respectively, so that the integration of an alternating current charging circuit and a direct current charging circuit is realized, the wiring harness used in a charging system is reduced, the system structure is simplified, and the arrangement space of the whole vehicle is saved. Control switches in a circuit for controlling the alternating-current charging pile to charge the power battery 2, such as a second control switch K2, a third control switch K3 and a fourth control switch K4, are integrated in the charger 3, so that the system structure is further simplified, and the cost and the arrangement space are saved.
It should be noted that, although the ac charging pile and the dc charging pile are both connected to the power battery 2 through the charging interface 1, when the ac charging pile is connected to the charging interface 1 through a charging gun, an ac/dc adapter is required to be provided between the charging gun and the charging interface 1, wherein one end of the ac/dc adapter is matched with the charging interface 1, and the other end of the ac/dc adapter is matched with the charging gun.
According to the specification of the charging standard in the electric vehicle field, the charging gun that performs ac charging for the power battery 2 using the ac charging pile and the charging gun that performs dc charging for the power battery 2 using the dc charging pile have different internal structures and resistance values, and therefore, the connection state determination unit 4 can determine whether the charging interface 1 is connected to the dc charging pile or the ac charging pile according to the resistance value of the charging gun connected to the charging interface 1.
Specifically, the connection state confirmation unit 4 is configured to determine that the charging interface 1 is connected to the dc charging pile when detecting that the resistance value of the charging interface 1 is a first preset resistance value; when the resistance value of the charging interface 1 is detected to be a second preset resistance value, it is determined that the charging interface 1 is connected with the alternating-current charging pile, wherein the first preset resistance value is smaller than the second preset resistance value.
In order to avoid that at least one of the first control switch K1, the second control switch K2 and the third control switch K3 is in a closed state when the charging interface 1 is not connected to the ac charging pile or the dc charging pile, and thus damage is caused to the power battery 2 due to erroneous charging at the moment of power-on, the controller 5 is further configured to control the first control switch K1, the second control switch K2 and the third control switch K3 to be in an open state when the connection state confirmation unit 4 detects that the charging interface 1 is not connected to the ac charging pile or the dc charging pile.
The user does through alternating-current charging stake when power battery 2 charges, charging system's working process is: firstly, when the connection state confirmation unit 4 detects that the resistance value of the charging interface 1 is a second preset resistance value, it is determined that the current alternating-current charging pile is connected with the charging interface 1, and the connection state confirmation unit 4 sends a detection result to the controller 5; secondly, the controller 5 controls the second control switch K2 and the fourth control switch K4 to be closed; then, when the current voltage of the power battery 2 sent by the vehicle controller or the battery management system is a preset voltage, the third control switch K3 is controlled to be closed, so that the alternating current is output to the power battery 2 through the third control switch K3 and the fourth control switch K4.
The user fills electric pile through the direct current and is when power battery 2 charges, the working process of the charging system who locates is: firstly, when the connection state confirmation unit 4 detects that the resistance value of the charging interface 1 is a first preset resistance value, it is determined that the direct current charging pile is connected with the charging interface 1 at present, and the connection state confirmation unit 4 sends a detection result to the controller 5; secondly, the controller 5 controls the first control switch K1 to be closed, so as to realize direct current fast charging of the power battery 2. Since the direct-current charging line between the charging interface 1 and the power battery 2 includes a positive line and a negative line, the first control switch K1 may be a two-way control switch, one way of which is connected to the positive line and the other way of which is connected to the negative line; or, first control switch K1 is single-way control switch, and sets up on positive circuit/negative pole circuit, then does not set up on the circuit of first control switch K1, sets up fifth control switch, just fifth control switch's control end with first control switch K1's control end can be connected same output of controller 5, of course, in order to improve the security of charging, also can connect different outputs of controller 5, when both connect different outputs, controller 5 needs simultaneous control first control switch K1 with fifth control switch closes or breaks off.
The following specifically describes a specific process of the controller 5 controlling the actions of the control switches:
as shown in fig. 1, a first output terminal of the controller 5 is connected to the first control switch K1, a second output terminal of the controller 5 is connected to the second control switch K2, and a third output terminal of the controller 5 is connected to the third control switch K3; a fourth output of the controller 5 is connected to the fourth control switch K4.
When the connection state confirmation unit 4 detects that the charging interface 1 is connected to the dc charging pile, the first output end of the controller 5 outputs a first signal to close the first control switch K1.
When the connection state confirmation unit 4 detects that the charging interface 1 is connected with the alternating-current charging pile, a second output end of the controller 5 outputs a second signal, so that the second control switch K2 is closed; a fourth output terminal of the controller 5 outputs a fifth signal to close the fourth control switch K4.
When the charging interface 1 is connected with the alternating current charging pile and the voltage of the power battery 2 reaches a preset voltage, the third output end outputs a third signal to close the third control switch K3, so that the pre-charging resistor R in the pre-charging circuit is short-circuited, and the alternating current flows through the third control switch K3 and the fourth control switch K4 to charge the power battery 2.
In order to avoid charging abnormality caused by abnormality of the signal output by the controller 5 due to a fault of the controller 5, and damage to the power battery 2 or the device in the charging system, in this embodiment, the signal output by the controller 5 needs to be detected, and therefore, as shown in fig. 2, the charging system according to the embodiment of the present invention further includes: a first signal acquisition circuit 61 connected between the first output terminal and a first input terminal of the controller 5, and a second signal acquisition circuit 62 connected between the second output terminal and a second input terminal of the controller 5; a third signal acquisition circuit 63 connected between the third output terminal and the third input terminal of the controller 5; and the seventh signal acquisition circuit is connected between the fourth output end and the seventh input end of the controller.
The first signal acquisition circuit 61 is configured to acquire the first signal and feed back the first signal to the controller 5; the controller 5 is configured to output a first fault signal to an instrument desk of the electric vehicle when the first signal is different from the first preset signal, so as to remind a user, and at the same time, the controller 5 is in a fault mode so as to stop working.
The second signal acquisition circuit 62 is configured to acquire the second signal and feed the second signal back to the controller 5; the controller 5 is configured to output a second fault signal to the instrument desk when the second signal is different from a second preset signal; thereby alerting the user and, at the same time, putting the controller 5 in a failure mode to stop working.
The third signal acquisition circuit 63 is configured to acquire the third signal and feed the third signal back to the controller 5; the controller 5 is configured to output a third fault signal to the instrument desk when the third signal is different from the third preset signal, so as to remind a user, and at the same time, the controller 5 is in a fault mode so as to stop working.
The seventh signal acquisition circuit 67 is configured to acquire the fifth signal and feed back the fifth signal to the controller 5; the controller 5 is configured to output a ninth fault signal to the instrument desk of the electric vehicle when the fifth signal is different from the fifth preset signal, so as to remind a user, and at the same time, the controller 5 is in a fault mode so as to stop working.
In order to reduce the energy consumption of the electric vehicle during the charging process, preferably, the controller 5 in this embodiment is a single chip, and the first control switch K1, the second control switch K2, the third control switch K3, and the fourth control switch K4 are all relays. Since the signal output by the single chip microcomputer is 3.3V high level or 0V low level, and the control voltage required when the relay is closed is 12V or 24V, voltage conversion circuits are connected between the controller 6 and the first control switch K1, and between the controller 6 and the second control switch 41. Of course, the controller 6 may be another control device, each control switch may be another type, and a conversion circuit needs to be provided between the controller 6 and each control switch as long as a signal output by the controller 6 is different from a control signal of each control switch.
Specifically, as shown in fig. 2, the charging system further includes: a first voltage conversion circuit 71 connected between the first output terminal and the first control switch K1; a second voltage conversion circuit 72 connected between the second output terminal and the second control switch K2; a third voltage conversion circuit 73 connected between the third output terminal and the third control switch K3; and a fourth voltage conversion circuit 74 connected between the fourth output terminal and the fourth control switch K4.
The first voltage converting circuit 71 is configured to output a first voltage signal having a first voltage value to the first control switch K1 in response to the first signal, so that the first control switch K1 is closed.
The second voltage converting circuit 72 is configured to output a second voltage signal having a second voltage value to the second control switch K2 in response to the second signal, so that the second control switch K2 is closed.
The third voltage converting circuit 73 is configured to output a third voltage signal having a third voltage value to the third control switch K3 in response to the third signal, so that the third control switch K3 is closed.
The fourth voltage converting circuit 74 is configured to output a fifth voltage signal having a fifth voltage value to the fourth control switch K4 in response to the fifth signal, so that the fourth control switch K4 is closed.
Similarly, in order to avoid that when the charging interface 1 is connected to the ac charging pile, a control switch connected to a faulty voltage conversion circuit cannot be turned on or off according to a signal output by the controller 6 due to a fault of each voltage conversion circuit, and finally the power battery 2 cannot be normally charged, as shown in fig. 2, the charging system further includes: a fourth signal acquisition circuit 64 connected between the output terminal of the first voltage conversion circuit 71 and the fourth input terminal of the controller 5; a fifth signal acquisition circuit 65 connected between the output terminal of the second voltage conversion circuit 72 and a fifth input terminal of the controller 5; a sixth signal acquisition circuit 66 connected between the output terminal of the third voltage conversion circuit 73 and a sixth input terminal of the controller 5; and an eighth signal acquisition circuit 68 connected between the output terminal of the fourth voltage conversion circuit 74 and the eighth input terminal of the controller 5.
The fourth signal acquisition circuit 64 is configured to acquire the first voltage signal and feed back the first voltage signal to the controller 5; the controller 5 is configured to output a fifth fault signal to an instrument desk of the electric vehicle when the first voltage signal is different from the first preset voltage signal, so as to remind a user, and at the same time, the controller 5 is in a fault mode to stop working.
The fifth signal acquisition circuit 65 is configured to acquire the second voltage signal and feed back the second voltage signal to the controller 5; the controller 5 is configured to output a sixth fault signal to the instrument desk when the second voltage signal is different from the second preset voltage signal, so as to remind a user, and at the same time, the controller 5 is in a fault mode so as to stop working; the controller is also used for acquiring the fourth voltage signal and feeding the fourth voltage signal back to the controller 5; the controller 5 is configured to output an eighth fault signal to the instrument desk when the fourth voltage signal is different from the fourth preset voltage signal, so as to remind a user, and at the same time, the controller 5 is in a fault state to stop working.
The sixth signal collecting circuit 66 is configured to collect the third voltage signal and feed the third voltage signal back to the controller 5; the controller 5 is configured to output a seventh fault signal to the instrument desk when the third voltage signal is different from the third preset voltage signal, so as to remind a user, and at the same time, the controller 5 is in a fault state to stop working.
The eighth signal collecting circuit 68 is configured to collect the fifth voltage signal and feed back the fifth voltage signal to the controller 5; the controller 5 is configured to output a tenth fault signal to the instrument desk when the fifth voltage signal is different from the fifth preset voltage signal, so as to remind a user, and at the same time, the controller 5 is in a fault state to stop working.
Here, when the ac charging pile is controlled to perform ac slow charging on the power battery 2, the control logic that the controller 5 controls the second control switch K2, the third control switch K3 and the fourth control switch K4 to be turned on or off may further be: the first method is as follows: firstly, the second control switch K2 and the fourth control switch K4 are controlled to be closed, and the third control switch K3 is controlled to be opened; then, when the voltage of the power battery 2 reaches a preset voltage, the second control switch K2 is controlled to be opened, and the third control switch K3 is closed. The second method comprises the following steps: firstly, the fourth control switch K4 is controlled to be always in a closed state, and secondly, after a signal that the alternating current charging pile is connected with the charging interface 1 is received, the second control switch K2 is controlled to be closed; then, when the voltage of the power battery 2 reaches a preset voltage, the third control switch K3 is controlled to be closed. The third method comprises the following steps: firstly, the fourth control switch K4 is controlled to be always in a closed state, and secondly, after a signal that the alternating current charging pile is connected with the charging interface 1 is received, the second control switch K2 is controlled to be closed; then, when the voltage of the power battery 2 reaches a preset voltage, the second control switch K2 is controlled to be opened, and the third control switch K3 is closed.
In order to meet the requirements of safety in the charging process and optimal operating conditions of the components of the charging system, in this embodiment, preferably, when the ac charging pile is not connected to the charging interface 1, the second control switch K2, the third control switch K3, and the fourth control switch K4 are all controlled to be in an off state; when the alternating-current charging pile is determined to be connected with the charging interface 1, the second control switch K2 and the fourth control switch K4 are controlled to be closed, and the power battery 2 is precharged; and finally, when the voltage of the power battery 2 reaches a preset voltage, controlling the second control switch K2 to be switched off, and controlling the third control switch K3 to be switched on, so as to charge the power battery 2.
When the power battery 2 is charged in the above preferred mode, the controller 5 is further configured to connect the charging interface to the ac charging pile, and when the voltage of the power battery 2 reaches the preset voltage, the second output end outputs a fourth signal to disconnect the second control switch K2.
Specifically, the second signal acquisition circuit 62 is further configured to acquire the fourth signal and feed back the fourth signal to the controller 5; the controller 5 is further configured to output a fourth fault signal to an instrument desk of the electric vehicle when the fourth signal is different from the fourth preset signal, so as to remind a user, and at the same time, the controller 5 is in a fault mode so as to stop working.
The second voltage converting circuit 72 is further configured to output a fourth voltage signal having a fourth voltage value to the second control switch K2 in response to the fourth signal, so that the second control switch K2 is turned off.
The fifth signal collecting circuit 65 is further configured to collect the fourth voltage signal and feed back the fourth voltage signal to the controller 5; the controller 5 is configured to output an eighth fault signal to the instrument desk when the fourth voltage signal is different from the fourth preset voltage signal, so as to remind a user, and at the same time, the controller 5 is in a fault mode so as to stop working.
Further, as shown in fig. 2, in order to ensure that the current signal input to the power battery 2 is stable, the charger 3 is further provided with a filter circuit 31, wherein the filter circuit 31 is disposed between the charging interface 1 and the pre-charging circuit and is used for filtering the alternating current input to the charger 3. In addition, since the charger 3 is configured to convert the ac current input to the charging interface 1 into the dc current input to the power battery 2, an ac-dc conversion circuit 32 is further disposed in the charger 3, wherein the ac-dc conversion circuit 32 is disposed between the pre-charging circuit and the power battery 2.
According to the charging system provided by the embodiment of the invention, an alternating current charging interface and a direct current charging interface on the existing electric automobile are integrated into the charging interface 1, so that the arrangement of each interface of the whole automobile is optimized; the alternating current charging system and the direct current charging system are integrated into one charging system, the number of charging wire bundles is reduced, the charging structure is optimized, the cost is saved, and the charging process is simple and convenient. The arrangement space of the charging system is further optimized by arranging a control switch in the charger 3; the switching between the direct current charging and the alternating current charging is realized by controlling each control switch in the charger 3 and the first control switch K1; the signal acquisition circuits are arranged at the output end of the charger 3 and the output end of each voltage conversion circuit, so that the detection of each output signal is realized, and the validity of each output signal is ensured.
The embodiment of the invention also provides an electric automobile which comprises the charging system.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (13)
1. A charging system is applied to an electric automobile and comprises: the charging interface (1) is used for being connected with the direct current charging pile or the alternating current charging pile through a charging gun; characterized in that, charging system still includes:
the power battery (2) is respectively connected to the charging interface (1) through a charger (3) and a first control switch (K1); the charger (3) comprises a third control switch (K3) and a pre-charging circuit which is connected with the third control switch (K3) in parallel and is used for pre-charging the power battery (2) by the charging interface (1), and a second control switch (K2) is arranged on the pre-charging circuit;
the connection state confirmation unit (4) is connected with the charging interface (1) and used for detecting the connection states of the charging interface (1) and the direct current charging pile and the alternating current charging pile;
the controller (5) is respectively connected with the connection state confirmation unit (4), the first control switch (K1), the second control switch (K2) and the third control switch (K3), and is used for controlling the first control switch (K1) to be in a closed state and the second control switch (K2) and the third control switch (K3) to be in an open state when the connection state confirmation unit (4) detects that the charging interface (1) is connected with the direct current charging pile; when the connection state confirmation unit (4) detects that the charging interface (1) is connected with the alternating-current charging pile, the first control switch (K1) and the third control switch (K3) are controlled to be in an open state, and the second control switch (K2) is controlled to be in a closed state; when the charging interface (1) is connected with the alternating-current charging pile and the voltage of the power battery (2) reaches a preset voltage, the third control switch (K3) is controlled to be in a closed state.
2. The charging system according to claim 1, wherein the connection status confirmation unit (4) is configured to determine that the charging interface (1) is connected to the dc charging pile when detecting that the resistance value of the charging interface (1) is a first preset resistance value; when the resistance value of the charging interface (1) is detected to be a second preset resistance value, the charging interface (1) is determined to be connected with the alternating-current charging pile, wherein the first preset resistance value is smaller than the second preset resistance value.
3. The charging system according to claim 1, wherein the controller (5) is further configured to control the first control switch (K1), the second control switch (K2) and the third control switch (K3) to be in an off state when the connection state confirmation unit (4) detects that the charging interface (1) is not connected to the ac charging post and the dc charging post.
4. Charging system according to claim 1, characterized in that a first output of the controller (5) is connected with the first control switch (K1), a second output of the controller (5) is connected with the second control switch (K2), a third output of the controller (5) is connected with the third control switch (K3);
when the connection state confirmation unit (4) detects that the charging interface (1) is connected with the direct current charging pile, a first output end of the controller (5) outputs a first signal to close the first control switch (K1);
when the connection state confirmation unit (4) detects that the charging interface (1) is connected with the alternating-current charging pile, a second output end of the controller (5) outputs a second signal to close the second control switch (K2);
when the charging interface (1) is connected with the alternating-current charging pile and the voltage of the power battery (2) reaches a preset voltage, the third output end outputs a third signal to close the third control switch (K3).
5. The charging system of claim 4, further comprising: a first voltage conversion circuit (71) connected between the first output terminal and the first control switch (K1); a second voltage conversion circuit (72) connected between the second output terminal and the second control switch (K2); and a third voltage conversion circuit (73) connected between the third output terminal and the third control switch (K3);
the first voltage conversion circuit (71) is used for responding to the first signal and outputting a first voltage signal with a first voltage value to the first control switch (K1) so that the first control switch (K1) is closed;
the second voltage conversion circuit (72) is used for responding to the second signal and outputting a second voltage signal with a second voltage value to the second control switch (K2) so that the second control switch (K2) is closed;
the third voltage conversion circuit (73) is configured to output a third voltage signal having a third voltage value to the third control switch (K3) in response to the third signal, such that the third control switch (K3) is closed.
6. The charging system of claim 5, further comprising: -a first signal acquisition circuit (61) connected between said first output and a first input of said controller (5), -a second signal acquisition circuit (62) connected between said second output and a second input of said controller (5); a third signal acquisition circuit (63) connected between the third output and a third input of the controller (5);
the first signal acquisition circuit (61) is used for acquiring the first signal and feeding the first signal back to the controller (5); the controller (5) is used for outputting a first fault signal to an instrument desk of the electric automobile when the first signal is different from a first preset signal;
the second signal acquisition circuit (62) is used for acquiring the second signal and feeding the second signal back to the controller (5); the controller (5) is used for outputting a second fault signal to the instrument desk when the second signal is different from a second preset signal;
the third signal acquisition circuit (63) is used for acquiring the third signal and feeding the third signal back to the controller (5); the controller (5) is used for outputting a third fault signal to the instrument desk when the third signal is different from a third preset signal.
7. The charging system of claim 6, further comprising: a fourth signal acquisition circuit (64) connected between the output of the first voltage conversion circuit (71) and a fourth input of the controller (5); a fifth signal acquisition circuit (65) connected between the output of the second voltage conversion circuit (72) and a fifth input of the controller (5); and a sixth signal acquisition circuit (66) connected between the output of the third voltage conversion circuit (73) and a sixth input of the controller (5);
the fourth signal acquisition circuit (64) is used for acquiring the first voltage signal and feeding the first voltage signal back to the controller (5); the controller (5) is used for outputting a fifth fault signal to an instrument desk of the electric automobile when the first voltage signal is different from a first preset voltage signal;
the fifth signal acquisition circuit (65) is used for acquiring the second voltage signal and feeding the second voltage signal back to the controller (5); the controller (5) is used for outputting a sixth fault signal to the instrument desk when the second voltage signal is different from a second preset voltage signal;
the sixth signal acquisition circuit (66) is used for acquiring the third voltage signal and feeding the third voltage signal back to the controller (5); and the controller (5) is used for outputting a seventh fault signal to the instrument desk when the third voltage signal is different from a third preset voltage signal.
8. The charging system according to claim 7, wherein when the charging interface (1) is connected to the ac charging post and the voltage of the power battery (2) reaches a predetermined voltage, the second output terminal outputs a fourth signal to turn off the second control switch (K2).
9. The charging system according to claim 8, wherein the second signal acquisition circuit (62) is further configured to acquire the fourth signal and feed the fourth signal back to the controller (5); the controller (5) is used for outputting a fourth fault signal to the instrument desk when the fourth signal is different from a fourth preset signal.
10. The charging system of claim 8, wherein the second voltage conversion circuit (72) is further configured to output a fourth voltage signal having a fourth voltage value to the second control switch (K2) in response to the fourth signal, such that the second control switch (K2) is turned off.
11. The charging system according to claim 10, wherein the fourth signal acquisition circuit (64) is further configured to acquire the fourth voltage signal and feed the fourth voltage signal back to the controller (5); and the controller (5) is used for outputting an eighth fault signal to the instrument desk when the fourth voltage signal is different from a fourth preset voltage signal.
12. The charging system according to claim 1, wherein the charger (3) is further provided with an ac-dc conversion circuit (32) connected to the pre-charging circuit, for converting an ac current output by the ac charging pile into a dc current.
13. An electric vehicle characterized by comprising the charging system according to any one of claims 1 to 12.
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| CN110148544B (en) * | 2019-05-05 | 2021-06-04 | 北京新能源汽车股份有限公司 | Method and device for preventing relay from being adhered |
| CN112124112A (en) * | 2019-06-25 | 2020-12-25 | 比亚迪股份有限公司 | Electric automobile and power battery charging and temperature maintaining control method and system |
| CN110614930B (en) * | 2019-09-30 | 2022-11-18 | 重庆长安新能源汽车科技有限公司 | Charging and discharging method, system, controller and electric automobile |
| CN110682818A (en) * | 2019-10-23 | 2020-01-14 | 西安电子科技大学芜湖研究院 | Novel universal charging management mechanism for electric automobile |
| CN111884307A (en) * | 2020-07-06 | 2020-11-03 | 深圳市昭恒新能源技术有限公司 | Charging circuit and vehicle charging equipment |
| CN114248641A (en) * | 2020-09-23 | 2022-03-29 | 宝能汽车集团有限公司 | Charging system of vehicle, vehicle and charging gun |
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